四大发明英文版介绍.ppt

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China Ancient Four Inventions 中国四大发明 Magnetic It's It's Importance Good science Good science PAPERMAKING The oldest paper Fang matan Paper History By CAI lun in eastern han dynasty (105) of the first year of yuan xing papermaking, improved by CAI lun in the bark, hemp heads and our raw materials such as cloth, fishing nets, after falling, dao, copy paper, drying technology, manufacturing, is the origin of modern paper. This paper, the raw material is easy to find and very cheap, quality is also improved, gradually widely used. In honour of the feat, CAI lun later generations called this paper "Cai Hou paper" The design of the papermaking process Until the eastern han dynasty and emperor period, through improved by CAI lun, formed a set of relatively finalize the design

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